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- (7N6 Model. M. MILLER.

' 'TRESTLE. No. 288,651. Patented Nov; 20, 1883. r

. MICHAEL-MILLER, or GLENWOOD, Iowa. 1 Q

""TRESTLEY srncrn cn'rron forming part of Letters Patent No. 288,651,dated November 2o, 1jsi3'.

Application filed March 26,-1883. {No.inodcl.) i

To aZZ whom it may concern.-

.Be it known that I, MIOHAELMILLER, a citizen of the Unit'ed'States,residing at Glenwood, in the county of Mills and State of Iowa, haveinvented a new and useful Trestle, of which the following is aspecification.

2 My invention relates to improvements in trestles; and the objects ofmy invention are,

first, to permit the trestle to be adjusted to different heights andlengths, without changing any of its parts, by merely altering therelative position of the parts; second, to permit the trestle to beadjusted to different heights by :ehanging the legs and then alteringthe relative position of the parts; third, to per mit trestles to beconstructed with less timber and materials, and to permit their usewithout injury to the materials, and to preserve the full strength ofthe, same; fourth, to permit trestles to be constructed without nails orcarpenters work; fifth, to permit trestles to be conveniently takenapart without injury to any part thereof; sixth, to permit trestles tobe easily put into small compass or space, without injury thereto, forconvenient removal, packing, transportation, or storage; seventh, toreduce the material requisite for the practical use of trestles; eighth,to secure immunity from accidents by the breaking or crushing down oftrestles. I attain these objects by the mechanism illustrated in theaccompanying drawings, in which Figure 1 is a View in perspective of theseveral parts of the adjustable trestle combined and set ready for use.It may be made of any desired length horizontally by changing the putlogor cross-piece D. j

Fig. 2 is aview in perspective of the metallic trestle-head A, showingthe slot to receive and support the putlog or cross-piece D of thetrestle; the pin-holes W, for fastening the putlog thereto, if desired;the pin or projection G to prevent the putlog working out of the slot;the shoulders O to meet the corresponding shoulders of the leg-socketsB; the slot H to receive the key 0; the jaws M to support the. pntlog,and the circular hinge-bearing J to enter the adjustable leg-sockets B,and to be position.

secured thereto by a pivot, if desired.

Fig. 8 is a perspective view of one of the hinge leg-sockets of thetrestlehead, showing the circular top fitted to receive the circularbearing of the part A, with slots 'i to receive the keyO and hold theparts in adjustment; the shoulder O; the pin-hole K to admit thefastening the leg L thereto, and the hook P to the top of the slot H,clears the upper part of 6 the leg-socket B, and which, when it rests inthe slots 2'', also projects into the slots H and holds the legsockets Band the head A in adjustment.

Fig. 5 is a perspective view of the metallic trestle-head A attached tothe adjustable legsockets B by apivot at J, showing the several partslettered, as hereinbefore described. Near the lower end of the adjustable legsockets B are made hooks or projections P to receive a chain,N, adjustable to any desired length, to hold the legs L at agivendistance apart, such distance being ascertained by so adjusting the legsand key 0 as to raise the head A to any desired height, and to diminishthe strain upon the key G and the pivot J,

arising from actual operation of the trestle. It also shows, withoutlettering, a pin to hold the putlog, inserted in the pin-holes 7. (Shownin Fig. 2.)

Fig. 6 is a perspective of one of the trestlelegs removed from theleg-sockets B,with triangular brace S, attached by pins, bolts, orscrews n, to the foot and upper portion of the leg.

Fig. 7 is a vertical section of the trestlehead A, attached to theleg-sockets 13, showing the sockets L, and showing by the dotted linesthe head and leg-sockets adjusted to a different The drawings show thetwo extremes of adjustment when the parts are placed upon legs of anygiven length.

Similar letters refer to similar parts throughout the several views,except that J refers both to the hinge-bearing of the trestle-head A andto the hinge-bearing of the leg-sockets B.

My inventionis designed to remedy the practical difficulties and expenseof constructing trestles for scaffolds for all purposes, encounteredwhen it is found convenient or necessary to change the height orposition of the same ICO in .actualuse. It is also designed to permittheir convenient removal from one place to another without injury orrebuilding and without loss of time in so doing. It is also designed topreserve the maximum strength of material composing them, and to permittrestles to be taken to pieces, stored conveniently, and again erectedwithout any loss of material or injury to or diminution of theircomponent parts. It is also designed to admit of trestles being accu-'rately adjusted to any desired height required for the economicalperformance of all kinds oflabor upon them. mit trestles to be used uponsloping ground by using legs of different lengths, as well as byadjustment. The head, legsockets, and key are of metal, the triangularbraces of either wood or metal, and the putlog and legs of wood. Its useand operation are like those of other trestles, except in the manner oferecting, tak- By using legs ing down, and storing them. andcross-pieces (putlogs) of different lengths the trestles may be made ofany desired length or height. If it is desired to make any moderateadjustment of height, it may be done by unhooking the chain N, raisingthe key Ginto the top of the slot H, and increasing or diminishing thedistance between the lower ends of i one to the same height as the oldone, and putting on additional plank. By putting other trestles underascaffold which is being used it maybe safely raised or lowered withouteven stopping the workmen.

My trestle can be conveniently used in a nar- Itis alsodesignedto'perrowhall or a wide buildingbymerely using putlogs ofdifferent lengths. It can be easily taken apart for storage ortransportation, and with ordinary use will last indefinitely. The mannerof its construction will be readily seen by reference tothe severaldrawings. What I claim as my invention, and desire to secure by LettersPatent, is

1 The combination of the key 0 with head A,having slot H, leg-sockets B,havingslots z, and the pivots J as and for the purpose shown anddescribed. v

2. The adjustable leg-sockets B, with circularhingebearing J, pivotedand fitted to3re-' ceive the hinge-joint J of the trestle-head'A,

with horizontal slots i, pin-holes'K,"shoulders O, hollow space L, toreceive the leg, hook P,

and adjustable chain N, combined with the me ltallic' trestle-head A andthe metallic key 0,

all constructed substantially as described.

3. The metallic key 0, in combination with the head A, having the slotH, the leg-sockets 2B, having the slots 1, and the pivot J, said key;being adapted to be entered in the slot Hand jengaged with the slots 2'before the head and ,sockets are connected by the pin, as and for thepurpose shown and described.

, 4. The combination of the metallic trestlehead A with the metallic key0 and the adjustable leg sockets B and the triangularbraced legs L, allconstituting, essentially, the improved trestle herein described, andall constructed substantially as described, andfor the purposespecified.

* I MICHAEL MILLER.

Vitnesses: WM. TURNER,

M. :H. MoGLUsKnY, WV. F. OTIS.

